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games/mix: fix STZ bug, print CMPA instruction

--- a/sys/src/games/mix/mix.c

+++ b/sys/src/games/mix/mix.c

@@ -288,7 +288,7 @@

 			break;

 	}

 	UNF(a, b, fpart);

-	if(res[i+1].c != opc)

+	if(res[i+1].c != opc || opc == 56)

 		return fmtprint(f, "%s\t%d,%d(%d | %d:%d)", res[i].name, apart, ipart, fpart, a, b);

 	while(res[i].c == opc && i < nelem(res)) {

 		if(res[i].f == fpart)

@@ -1018,7 +1018,7 @@

 			cells[m] = mixst(cells[m], r, f);

 			break;

 		case 33:

-			cells[m] = 0; /* STZ */

+			cells[m] = mixst(cells[m], 0, f);

 			break;

 		case 34:

 			curpc = mixjbus(m, f, curpc);